Tree jack



Jan. 21, 1941. l.. w. PINKHAM` 2,229,521

TREE JACK Filed April 8. 1939 3 Sheets-Sheet l A orneys L W. PINKHAM TREE JACK 1 Inventor [EsrEk W PNV/(HA M,

Filed April 8; 1939 Jan. 21, 19111.

Jan. 2l, 1941.

L w. PINKHAM "TREE JACK Filed April 8, 1939 3 Sheets-Sheet I5 A ome ys Patented Jan. 21, 1941 "UNITED STATES PATENT loFFlcE 2 Claims.

This invention appertains to new and useful improvements in jacks especially adapted for pushing over trees which are leaning back or which have been cut to a point where they can be pushed over.

The principal object of the present invention is to provide a jack which can be used for various kinds of work such as in lifting falling tree trunks so that they can be placed on to drags, sleds, rollers or other conveyances.

Another important object of the invention is to provide a jack of the character stated which is of simple construction and capable of easy operation.

Still another important object of the invention is to provide a jack which because of its sturdy and positive acting construction will not readily develop defects.

These and other important objects and advantages of the invention will become apparent to the reader of the following specification.

In the drawings:

Figure 1 is a side elevational View.

Figure 2 is a fragmentary front elevational View.

Figure 3 is a fragmentary rear elevational view.

Figure 4 is a fragmentary top plan View.

Figure 5 is a section on the line 5-5 of Figure 1.

Figure 6 is a section on the line 6--6 of Figure 2.

Figure 7 is a sectional view on the line 'I'I of Figure 3.

Figure 8 is a fragmentary side elevational View of an extension for use in conjunction with the present invention.

Referring to the drawings wherein like numerals designate like parts, it can be seen that the device consists of the elongated barrel which has the pointed block 6 at its lower end. Operative in this barrel 5 and through the top thereof is the jack bar 'I which on its front side has the -lrack teeth 8. At the desired point on the barrel 5 are the two side plates 9-9 which have forwardly extending and reduced portions IIl-I 0 between which is mounted the gear II with the integrally formed ratchet wheels I2-I2 at its opposite side. This gear II is keyed as at I3 to the shaft I 4 which has the crank handle I5 at one end. The gear I I operates through the opening I3 in the front wall of the barrel 5 and meshes with the teeth 8 of the jack bar 'I. A plate II bridges the rear ends of the plates99 to dene the guideway I8 in which the slidebar I9 is slidably disposed, this bar having the foot 2D at its lower end which can be engaged under fallen tree trunks to permit elevation thereof.

As can be seen in Figure 7, the upper end of the jack bar 'I is reduced and provided with the extension 2| which is pointed at its upper end as at 22. A collar 23 is provided on the reduced extension 22 and rests on the shoulder 24 of the jack bar 1. The upper end of the slide bar I9 is disposed laterally as at 25 and apertured to receive the reduced extension 22.

Obviously, when the hand lever 26 is moved downwardly to disengage the pin 21 from the gear I I, the elongated hand bar 28 can be swung upwardly after which the pin 21 can be released and by pulling downwardly on the hand bar 28, the gear II will drive the jack bar 1 upwardly. When there is no load involved, the jack bar 'I can be elevated by actuating the hand crank I5. When it is desired to release the jack bar I so that it can return from a jacking position, the rod 29 can be pulled and this will rock the arms 30 against the tension of the spring 3l and cause rotation of the shaft 32 on which the pawl 33 is located, thus disengaging the pawl 33 from the If desired, an extension 35 can be provided for the upper end of the jack bar 1, this extending section 35 having a socket at its lower end for the upper end of the bar, and, of course, if desired, a further bar 36 can be engaged into the upper end of the section 35 and suitably secured as'at 31. In this way exceptional height can be reached with ease. 38 is a stop secured to the barrel and limiting movement of rod 29. 39 is a lug extending from the barrel and guiding the rod.

While the foregoing specification sets forth the inventionin specific terms, it is to be understood that numerous changes in the shape, size and materials may be resorted to without departing from the spirit and scope of the invention as claimed hereinafter.

Having described the invention, what is claimed as new is:

1. A jack comprising a barrel, a jack bar longitudinally slidable in the barrel and provided with a reduced extension at one end dening a shoulder, a pair of plates secured to opposite side portions of the barrel, operating means for the jack bar mounted between a pair of the end portions of said plates, bridge means between the remaining ends of the plates defining a guideway, a slide bar slidably disposed through the guideway and provided with a foot at one end, said slide posite end formed with an opening for receiving the reduced portion of the jack bar, said opening 10 ing ends of the plates dening a guideway, a

slide bar sldably disposed through the guideway and provided with a foot at one end, said slide bar having a laterally disposed head at its opposite end formed with an opening for receiving the reduced portion of the jack bar, said opening in the head being of less diameter than that of the jack bar, and a collar circumscribing the reduced portion of the jack bar and being interposed between the shoulder and the head of the slide bar.

LESTER W. PINKHAM. 

